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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Innovative Technique for Seismic Upgrade of RC Square Columns
Author(s): A. Prota, G. Manfredi, A. Balsamo, A. Nanni, and E. Cosenza
Publication: Special Publication
Appears on pages(s): 1289-1304
Keywords: column; ductility; FRP; smooth bars; strength hierarchy
Abstract:The preliminary results of an experimental investigation on under-designedRC square columns are presented in the paper. The seismic upgrade was achieved bycombining steel spikes and GFRP laminates. Two parameters are investigated: the lapsplice of the longitudinal steel reinforcement and the level of axial load. A comparisonbetween as-built and strengthened columns is presented in terms of strength andductility. The shear-top displacement relationships of strengthened columns areanalyzed to assess the influence on the global performance of the lap splice. Thispreliminary analysis confirms that the proposed solution for the seismic strengtheningof under-designed columns is very effective when it is necessary to relocalize thepotential plastic hinges of columns by increasing their flexural strength. The obtainedresults will represent the basis for developing design criteria for the strengthening ofsimilar interventions and will represent a reference for the calibration of a model of thestrengthened column.
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